<!doctype html>
<html lang="en">
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>Bootstrap demo</title>
    <link href="https://cdn.staticfile.org/twitter-bootstrap/4.3.1/css/bootstrap.min.css" rel="stylesheet">
    <script src="https://cdn.staticfile.org/twitter-bootstrap/4.3.1/js/bootstrap.min.js"></script>
    <script src="https://cdn.staticfile.org/jquery/3.2.1/jquery.min.js"></script>
  </head>
  <body>
    <nav class="navbar navbar-expand-lg navbar-light bg-light">
        <a class="navbar-brand" href="#">分类信息网</a>
        <ul class="navbar-nav mr-auto">
          <li class="nav-item active"><a class="nav-link" href="#">首页</a></li>
          <li class="nav-item"><a class="nav-link" href="#">个人中心</a></li>
          <li class="nav-item"><a class="nav-link" href="#">欢迎**用户</a></li>
          <li class="nav-item"><a class="nav-link" href="#">帮助中心</a></li>
        </ul>
      </nav>
  </body>
  </html>